Other Parts Discussed in Thread: MMWAVEICBOOST, , AWR2243
As shown in the above setup diagram, the MMWAVEICBOOST allows us to synchronize two radars in the time domain:
Master radar: software-triggered =>
- transmits frames periodically.
- Producing a mono-pulse on GPIO_2 of the master radar in its FRAME_START interrupt.
Slave radar: hardware-triggered =>
- transmits frames when observing a pulse in SYNC_IN.
- Producing a mono-pulse on GPIO_2 of slave radar in its FRAME_START interrupt.
As shown in the above figure, we observe that the time shift (GPIO_2 of slave radar – sync in of slave radar) will jump periodically.
The jump means that approximately every second, the FRAME_START interrupt of the slave radar is observed with a delay of ~50ns instead of ~12ns. This creates a delay in the propagation delay between both radars (this is what we can see on the figure). We would like to always get the same offset of ~12 sec.).
We also by-passed the crystal of the slave radar in order to inject the clock signal of the master radar such that both radars have the same local oscillator. This had no impact on the jump (periodicity, time shift)
Question:
1. why the jump will happen?
- how to remove this jump?
Best regards,
Jialun
